<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>内部样式表</title>
    <style type="text/css">
        .font{
            color:red;
            font-size:20px;
            background:1px #66ccff;
        }
    </style>
</head>
<body>
<p class="font">我是一行内部样式表</p>
</body>
</html>